Low‐profile circularly polarized cylindrical dielectric resonator antenna coupled by L‐shaped resonating slot

Abstract

The aim of this work is to design a low‐profile Circularly Polarized Dielectric Resonator Antenna for the X‐band frequency applications. With optimized design the proposed Cylindrical DRA (CDRA) fed by off‐centered L shaped slot is showing characteristics of Circular Polarization in the proposed band. Two orthogonal arms of off‐centered L shaped slot having different dimension excite the two TM01δ modes at 9.5 and 10.5 GHz, in addition both slots itself produce resonances nearly at 8.6 GHz. Combination of all these resonances is generating the nature of circular polarization near 9.5 GHz. Parametric study on designed antenna has been done in order to determine the effect of design parameters on the circular polarization. Axial Ratio bandwidth of 10.5% (1 GHz) and impedance bandwidth of 25% (2.3 GHz) at 9.5 GHz has been shown for single and simple feed low‐profile CDRA. Prototype of optimized design has been fabricated for the validation and measured results have shown good agreement with simulated ones. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:996–1000, 2017

A chronological review of circularly polarized dielectric resonator antenna: Design and developments

“…This section highlights the state‐of‐the‐art developments of CPDRA using single point feed 11‐64 and multi‐point feed power divider, 65‐76 along with modification of three dimensional DR shapes 77‐103 . In this review article, the authors have segregated CP mechanism in terms of excitation of feeding techniques like microstrip line, coaxial probe, and aperture coupled feed, which will be helpful to the researcher to get the complete idea about the developments of particular excitation feeding method …”

“…One of the fundamental subjects in the broad area of DRA is the excitation scheme, which deals with the problem of how to couple the electromagnetic energy from the feeding transmission line to the dielectric radiator efficiently. Feeding techniques can be divided into single point feed and multi‐point feed power divider, which plays an important role in generation of CP for the case of DRA over three and half decades 11 ‐76 …”

Single-feed circularly polarized rectangular dielectric resonator antenna coupled with dual mode slot-line square ring resonator

“…The fourth is to add metallic strips onto DRAs' side walls [11,12]. And the last is to modify the coupling aperture embedded on the ground plane [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37].…”

“…The aperture-coupling excitation method with a microstrip feed-line has the advantage of having the feed network located below the ground plane, thus avoiding spurious radiation and the advantage of integrating DRAs with printed feed structures [38]. Therefore, this excitation method has usually been used to excite the DRAs [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,39] and the last method of designing a single-feed CP DRA (modifying the coupling aperture embedded on the ground plane) is the most popular one by designers. There are many kinds of modified coupling apertures used to design single-feed CP DRAs.…”

“…The simplest one is to incline the rectangular coupling slot at an angle or off-center it relative to the DRA [13,14,15,16]. The unequal cross slots [17,18,19,20,21,22,23], the open annular slots [24,25,26,27,28,29,30,31] and the ring slots [32,33,34,35,36,37] are the other tree simple coupling apertures to design single-feed CP DRAs. When ring slots are used as the coupling structures, the feeding microstrip line printed on the bottom surface of the substrate usually needs to pass through the ring to form a quasi-dual feeding structure [32,33,34,35,36].…”